Today I sold a SPY 90 Put for 4.25 pts that expires November 21st. Assuming the market goes below 90 before then, and the option buyer exercises it, how will I know that I've been assigned 100 shares at 90? Once I'm assigned, am I then safe to sell a call against the 100 shares I'm long? How does IB let you know that the options been exercised? Thanks
